2. What is the scale and basic structure of an atom?

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). The size of a typical atom is about 10-10m. Hope this helps :)

Explanation:

astronomers such as edwin hubble.